Riders Alliance will ask commuters for input and support for a petition to the MTA.
The victim's condition was not immediately clear, and B, C, A and D lines were affected, the FDNY said.
The 6, 7, A, C, D, E, F, J, M, N, Q and R trains are slated for service disruptions this weekend.
Keyshawn Brown, 16, "knowingly placed" a metal rail sign on the tracks at Nostrand Avenue, police said.
Video shows a small explosion and sparks as a C train pulls into the Nostrand Avenue station.
Officers observed Corey Johnson moving between multiple cars, NYPD said.
Shawn Howard of the Bronx attacked three people on the A and C trains, police said.
The man was taken to Kings County Hospital in serious but non-life threatening condition.
The 1, 2, 3, 5, 6, 7, A, C, D, E, F and 42nd Street Shuttle will all be affected.
MTA is modifying service on 1, 2, 4, 6, A, C, D, E, L, N and R over the weekend, so plan accordingly.
Trains along several subway lines were disrupted because of a power outage, officials said.
The 4, 5, 6, 7, A, C, E, Q and the 42nd Street shuttle will be disrupted this weekend.
The 4, 5, 6, 7, A, C, D, E, F, L, Q and Times Square Shuttle are all affected.
The 4, 5, 6, 7, A, C, E, F, N, Q and R lines are slated for service changes.
The 2, 3, 4, 5, 6, 7, A, C, D, E, F, Q and 42nd Street Shuttle will all be disrupted.
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